A2B2O7 mixed metal oxides are interested for their possible applications. A2B2O7 compounds are used as photocatalyst for water splitting [1]. The compounds have an excellent power for fixing matrices of highly active radionuclides from nuclear wastes [2]. They are also used in electrochemical devices due to their ionic conductivity . Besides, A2B2O7 compounds are known for their piezo-/ferroelectric properties, used for high temperature devices, and for their attractive photo-luminescent properties when associated with other lanthanide ions [3–4]. Nd2Ti2O7 nano-sponges were fabricated via a conventional solid state rout at 800 ºC for 8 h when Nd2O3 and TiO2 were used as raw materials. Crystal structural analyses and purity of the obtained materials were analyzed by FullProf program that used profile matching condition with constant scale factor. Field emission scanning electron microscope (FESEM) was applied to study the morphology of the fabricated samples. Ultraviolet – Visible (UV-Vis) spectroscopy showed that the direct optical band gap energies was 3.40 for Nd2Ti2O7. The synthesized nanomaterials were used as heterogeneous photocatalysts for the degradation of some water pollutant organic dyes under direct visible (with fluorescent light with 40 W Power) and UVC lights illumination. Malachite green (MG) was used as a typical dye to obtain the optimum photocatalytic degradation conditions. The photocatalytic performance of the as-fabricated samples on the degradation of the pollutant dyes was studied under visible and UVC light irradiations. The optimum conditions were 35 mg of catalyst, 0.05 mL of H2O2 and 40 min reaction time. The photocatalytic reaction yield was 97% at the present conditions.
